The present invention provides a construction material screening
machine, including a frame body, a multi-stage screen
assembly, a crushing mechanism, a driving mechanism and a shaking mechanism, a collision mechanism is compounded on one side of the shaking mechanism, an eccentric shaft is fixed to the toothed disc at the output end of the driving mechanism, a bearing sleeve is provided outside the eccentric shaft, the sleeve is connected to a push-pull rod, a hinge seat is fixed on a joint plate, and the push-pull rod is hinged in the hinge seat; an
electromagnet is fixed at the bottom of the cylindrical cavity of the eccentric shaft, a cone is matched and provided in the cylindrical cavity, a radially extending
assembly is installed on the side wall of the cylindrical cavity, a Z-shaped swing rod is hinged on the push-pull rod, a roller is installed at the rear end thereof, and an elastic traction mechanism and a collision hammer are connected at the front end. The present invention utilizes a driving mechanism and a shaking mechanism to realize reciprocating shaking, so that the screening energy is concentrated on the screen layer, the stability of the whole
machine is not affected, the energy is only transmitted to the screen layer, the effective utilization of the vibration energy is ensured, and the hammering function realized by the collision mechanism effectively prevents the screen layer from being blocked.